Method of freeing and ejecting die castings formed on cores



0. GRIES ETAL Jan. 8, 1952 METHOD OF FREEING AND EJECTING DIE CASTINGS FORMED ON CORES s Sheets-Sheei: 1

Filed Aug. 1, 1947 INVENTORS OTTO GRIES LOUIS H. MORIN ATTORN Y ii If Jan. 8, 1952 GRES Em 2,581,854

METHOD OF FREEING AND EJECTING DIE CASTINGS FORMED ON CORES Filed Aug. 1, 1947 3 Sheets-Sheet I) l ENTOR OT GRIES' B LOUIS H. MORN ATTORNEY Patented Jan. 8, 1952 METHOD OF FREEING AND EJECTIN G DIE CASTINGS FORMED ON CORES Otto Gries, New Rochelle, and Louis H. Morin, Bronx, N. Y.; said Gries assignor of one-half to Crown Fastener. Corporation, Warren, R. I., a corporation'of Delaware Application August 1, 1947, Serial N 0. 765,330

Claims.

This invention relates to the formation of die castings on core pins or members disposed between and entering the cavity of a pair of dies. More particularly, the invention deals with a method of first freeing the core pin from the casting, thus using the core pin to eject the casting from the die cavities and then to finally strip the casting from the core pin.

The novel features of the invention will be best understood from the following description when taken together with the accompanying drawings, in which certain embodiments of the invention are disclosed, and in which the separate parts are designated by suitable reference characters in each of the views, and in which:

Fig. 1 is a diagrammatic sectional view illustrating the formation of a casting on a core pin and illustrating means for removal of the casting from the pin.

Fig. 2 is a sectional view through the dies and part of the core pin structure, the section being on the line 22 of Fig. 1 and indicating the dies in open position in dot-dash lines.

Fig. 3 is a view similar to Fig. 1 showing the casting in section and illustrating the first step in freeing the casting on the core pin.

Fig. 4 is a view similar to Fig. 3 showing the step of ejecting the casting from the core pin.

Fig. 5 is' a view similar to Fig. 1 showing a modified method of procedure.

Fig. 6 is a view similar to Fig. 5 showing the step of freeing the core pin in the casting.

Fig. '7 is a view similar to Fig. 6 showing the step of stripping the casting from the core pin.

Fig. 8 is a view similar to Figs. 1 and 5,showing another form of construction for actuating the core pin.

Fig. 9 is a view similar to Fig. 8 showing only a part of the construction, with parts in a different position; and

Fig. 10 is a view similar to Fig. 9 showing the operation of removin the casting from the die and stripping the casting from the core.

' In Figs. 1 to 4 inclusive, we have diagrammatically illustrated one method of procedure in freeing a casting on a core pin, ejecting the casting from the dies and stripping the casting from the core pin. In Figs. 1, 3 and 4, we have indi-. cated at ll, one die of a pair of relatively movable dies, the companion die being shown at I I' in Fig. 2 of the drawing. In illustrating one adaptation of the invention, we have shown the dies as having a cavity I2 for the formation of a Winged nut I3, the nut having a central tubular portion 14, the bore I5 of which, note Fig. 3, is formed by a reduced end [6 of a core pin [1. The pin I! is arranged in a tubular portion ll of the dies.

At I8 is shown an injection nozzle for injecting casting material into the cavity I2 through a gate passage I9, in a manner well known in the art. This forms on the resulting casting, a gate part 20, which is removed in any suitable manner.

' Supported over the dies is a U-shaped bracket 2|, one part 22 of which has an aperture 23 to guide the pin I I, the other part 24 has a large aperture 25 to clear the pin I! as well as a sleeve 26 slidably mounted on the pin. The sleeve 26 forms a casting stripper element, as will later appear. The upper surface of the part 24 forms a stop shelf 21 against which a collar 28 fixed on the pin I1 rests in properly positioning the end I6 of the pin within the die cavity l2. Suitable means of adjustment can be provided for this purpose. Mounted on the pin l1 between the part 22 of the bracket and the collar 28 is a spring 29 which normally supports the collar in engagement with the shelf or stop 21.

The sleeve 26 has centrally thereof a pair of circumferential collars, as at 36, forming an annular recess 3| therebetween. Swingably mounted on a shaft or rod 32 is a lever 33, the forked end 34 of which includes pins, as indicated at 35, which operate in the annular recess 3| in movement of the sleeve 26 longitudinally of the pin [1.

The method of procedure in freeing, ejecting and'stripp'ing' a casting will be as follows:

In Fig. 1 is shown the position of the parts as and when a casting I3 is formed on the end 16 of the core pin l1.' Immediately upon completion of the formation of the casting, the lever;

. 33 is swung upwardly by any suitable means to raise the sleeve 26 into the position shown in Fig. 3, in which operation the sleeve engages the collar 28 and thus moves the core pin I1 vertically against the action of the spring 29 and this frees the end IS in the casting l3. In the chilling 'of the casting, as is the usual practice, there is a tendency for the casting to shrink upon a pin, and the upward movement referred to above, frees the pin end l6 against the shrinking action. 7

The above operation is performed while the dies are still in closed position, and the upward movement is sufficient to provide the freeing actio while at thesame time, leaving the end I6 of the pin .still frictionally disposed within the bore I5 Of'the casting I3. The next step in the operation is to separate the dies, moving the same into the dot-dash position shown in Fig. 2. In this operation the casting is automatically ejected from the die cavities and re mains supported on the end "5 of the pin [1. In the next operation, the lever 33 moves downwardly, bringingthe sleeve 26 from the position shown in Fig. 3 to the position shown in Fig. 4, in which latter position the lower end of the sleeve 26 has moved beyond the end limits of the end I6 of the core pinythu's stripping the casting I3 from the core pin and allowing-it to drop into a suitable receptacle, not-shown: ejected or released or stripped casting is shown below the dies in Fig. 4 of the drawing. After f rming a winged nut l3 similar to the winged 3 At 11' is shown a core pin similar to the pin I! and having a reduced end I6 similar to the completing the operation in Fig. 4, the lever 33-- shown, it is possible 'to produce diecastingsat a high rate of speed, in that a minimum amount of motion takes place within each cycle of operation'of the machine and by contributing only two motions to the dies or die; namely one opening movement and one closing movement.

In Figs. 5 to 7 inclusive,'we have shown a slight modification of the methodof procedure shown in Figs. 1 to 4: The dies or die H are the same as that shown in Figs.-1 to 4, the casting I3 is the same, as is also the ejector nozzle 18. In Figs. 5to 'I-incIusive, we have shown at 36 a core pin having a reduced end '3'! similar to the end It. The pin 6-is 'slidably mounted' inan elongated aperture 38 of a bracket 39, and swing ably mounted inthe bracket 3 is a lever40 generallysimilar-to the lever 33 and having a forked end 41 operating upon a-pulley-like sleeve 42 secured upon the upper reduced end 43 of the pin by means of a nut 44. The sleeve 42 normally seats-upon a stop shelf 45 at the upper end of the bracket 39: in properly positioning the end 37 of the core pin within the cavity I2of the die.-

With-this construction, after the casting has been formed, and while the dies are still in closed position, the pin" 3!; is first moved upwardly by the lever igasi indicated in Fig. 6 of the drawing to free the endii 'l in the-casting l3, thenthe'dies are separated and the casting I3 is ejected from the cavity 12 whereupon the lever is-again moved an upward direction which raises the pin 36 within the aperture 38 so as to strip thecasting [3' from "the pin'by engagement-wtihthe -lower end 'ofthe"bracketed-the result of which op eration i's 'shownin Figs-7 of the drawing where the "l 3 shown below the die H."=--

From the foregoingy-it will be apparent that in th'e'mthodof procedure shown in Figs.-5 to "l".

inclusive, the one lever 40 is employed'and this lever is given two upward motions forfreeing and: then stripping the casting, the first motion being slight, bringing the lever to a-stop-position as shown in Fig} 6, whereupon the upward motion" is continued and after the castinghas been removed or stripped from the corepin, the lever d0 is then swung down into the position shown in Fig. 5, the dies are again closed and w 7 of operation is again'repeated.

In Figs. 8 to 10' inclusive is shown anothermethodof procedure. thesefiigurespa stagthe cycle end'lfi. "Orr'the pin II" is arranged a sleeve 26 similar to the-sleeve 26, the pin II also having acollariv-similar to the collar 28. At 33 is shown a lever similar to the lever 33 for operatingthe sleeve 26". In Fig. 8, an actuating lever 5d-is' als'o indicated as extending through an elongated aperture in the slide 52 and at 55 is shown a rod or link for actuating the lever 54.

The slide-52 around the pin H and beneath the'collar 28{ has a stop platform or shelf 21' similar to the shelf 21 in alinement of the end l6' ;of the core pin inthe cavity l2. At 29;" is

shown a spring similar to the spring 29 and at 51 is shown an arm similar to the bracket end 22, apertured as seen at 58, to guide the pin II,

The slide "52 includes downwardly extending members 59 in which is supoorted'the pin or shaft 60 to which the levers 33' and 54 are secur ed so that the levers operate'as a unit with the slide 52; t The'primary difierence in the method of procedure shown in Figs. 8 to 10 inclusive over that illustrated in Figs. 1 to'4 inclusive,resides in the use of a fixed die and a movable die, thus-requiring an additional movement to the core pin over that illustrated in Figs. 1 to 4 inclusive. In other move the "core pin [1 from the'position'shown in Fig. 9 to that shown'in Fig. 10, thus ejecting thecasting from the fixed die 41 and bringing the casting in positionto be stripped from the core pin; The levers 33' and 54 are now oper ated to move the sleeve 26' downwardly on the core pin stripping'the casting therefromthe same as in Fig, 4-of the drawing. After comnext was oiy operation is repeated.

In order to'simplifyjthe present diagrammatic illustrations, we have shown the formation of a single type and kind of casting in the several views. Itwill be understood, however, that castings of. any desired shape orcontour can be o heri e arly. where e in e? m was. 9 1' s u i z d a a means for ejecting.

casting fronji thecavities of. the diesandas. a

dinthe productionofthe casting, or where:

means for supporting the casting in the stripping operation.

It willbe apparent that the sleevemembers 26-26' as well as that part of the bracket 39 disposed upon the pin 36 constitute strippers or stripper members for stripping the casting from the pin or core member. In this connection it will be understood that with the structure shown in Figs. 1 to 4 and 8 to 10 inclusive, the core or pin member is automatically returned to alined position with respect to the cavities by the springs 29-29' during the stripping operation so that the pin or core member is in position to be engaged by the dies when the dies are closed. It will further be apparent that when the dies are separated, as in Figs. 4 and 7 inclusive, Or when the pin member is moved into position spaced with respect to both dies, as indicated in Fig. 10, the pin or core member is arranged in what may be termed a stripper station, leaving the casting free for discharge into a suitable receptacle when the same is stripped from the pin or core member.

Having fully described our invention, what we claim as new and desire to secure by Letters Patent is:

1. The method of forming, ejecting and discharging die castings, which comprises forming a die casting on a pin member supported within the cavities of a pair of relatively movable dies,

moving the pin member relatively to the casting while supported in the dies to free the casting from seizure on said pin member, moving the dies out of contact with each other and also out of contact with the pin member and the casting, and then stripping the casting from the pin member by a stripper mounted on and movable longitudinally of said pin member.

2. The method of forming a die cast body about a core member in a pair of dies and then discharging the body from said dies and member which comprises: casting said body about the core member while the latter is positioned in a die cavity formed by the closed dies, moving the member partially away from the body while the dies. are still closed to partially break the grip of the die castbody thereon, opening the dies, moving the member with the body supported thereon back to the original position of said member, stripping the body from the core memher, and closing the dies about the stripped member preparatory to casting another body thereon.

3. The method of forming a die cast body about a core pin in a pair of dies and then discharging the body from the dies and core pin which comprises first forming the casting on the core pin supported within the cavities of the closed dies, then moving the core pin relatively to the casting with the dies retained in closed position to free the casting against seizure on the pin, then moving one die into open position, then moving the core pin with the casting thereon away from the other die to eject the casting from the last named die and to move the core pin into stripping position, and then stripping the casting from the core pin by a stripper member arranged upon the core pin by moving the member and core pin one relatively to the other in the stripping operation.

4. The method of forming, ejecting and discharging die castings, which comprises forming a die casting on a pin member supported within the cavities of a pair of closed dies one of which is fixed, then while the dies are in their original closed position moving the-pin member partially out of the casting in cider to free the casting from seizure on the pin member, separating the dies by movement of one die away from the fixed die, supporting the casting in the cavity of the fixed die by said pin, then moving the pin and casting out of the fixed die to a stripper station spaced with respect to both dies, and stripping the casting from the pin member by means of a stripper movably arranged on said pin member.

5. The method of forming a die cast body about a core pin in a pair of dies and then discharging the body from the dies and core pin which comprises first forming the casting on the core pin supported within the cavities of the closed dies, then moving the core pin relatively to the casting with the dies retained in their original closed position to free the casting against seizure on the pin, then separating the dies and ejecting the casting therefrom so that the latter is entirely out of contact with the dies, said casting being still attached to the pin, then stripping the casting from the core pin, and then closing the dies around the core pin preparatory to forming the next successive casting.

OTTO GRIES. LOUIS H. MORIN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,645,726 Vaughn Oct. 18, 1927 1,695,001 Wood Dec. 11, 1928 2,391,527 Tracy Dec. 25, 1945 2,428,174 Morin Sept. 30, 1947 

